K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other applications. Regardless of the angle or offset diameter of the air intake, there is probably a K&N Universal air filter for your equipment. All filters are constructed with ultra-strong molded pliable rubber flanges which absorb vibration and allow for secure attachment and can also be stretched for up to 1/16 of an inch (1.5mm) to fit in-between sizes. K&N universal air filters are washable and reusable.

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K&N RU-1100 Universal Clamp-On Air Filter Product Reviews

If you want the OLD School- K&N for Yamaha RD's this is it- Don't tell any one though.
Works great, fits like they did in the 80' all Good.
JT

JT

Texas

Tuesday, December 1, 2015
- Part
RU-1100

Hellishly expensive, but K & N has been hellishly expensive for the 30 years I've been using them. I put two of these RU-1100s onto the mikunis carbs on my fairly heavily-modified 72 triumph bonneville street bike, after measuring the clearances, top to bottom, side to side, and front to back. The filters fit just like I planned, and work just like I intended. T
the significant thing that makes K & N worthwhile, aside from the quality of the filters themselves, is the extensive size information available online. I'm used to having to guess how big things are based on vague descriptions, and then sending them back for a second try, or a third, or giving up. The very complete and specific information on the K & N website allowed me to work out exactly what I needed from fifteen or twenty alternative lengths, widths, and inside and outside diameters, and the filters fit perfectly, with exactly the clearances I planned. I
i also use four K & N filters on my 74 triumph trident, three on the 26mm mikuni carburetors and another on the crankcase breather. I
i'm running 35mm keihin FCR carbs on my 1965 triumph land speed race bike, and if I could figure out how to put filters over the FCR open velocity stacks, I'd use them there. No application for those carbs, unfortunately. if you come up with one I'll use them.